Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bb58ab89dee249…

MALICIOUS

PDF

79.7 KB Created: 2021-04-01 18:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ac74768a5878faf2a18102ee34f0ec6 SHA-1: 94b117a9ded2d9b26d02c7709204936670c40460 SHA-256: c0bb58ab89dee2490de5e5651924b281f8c4784c9d080a9d80e199d55ec1bc9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links, specifically a 'link farm', suggests an attempt to manipulate search engine results or direct users to potentially malicious content. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=no+no+boy+john+okada+summary.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/strik?utm_term=no+no+boy+john+okada+summary
    • https://gozivuwedigati.weebly.com/uploads/1/3/4/6/134612943/daketunubes-paporiki.pdf
    • https://static.s123-cdn-static.com/uploads/4369511/normal_5ff62c08e99ac.pdf
    • https://wusatotaluvak.weebly.com/uploads/1/3/4/4/134469206/bekagofojonef-teredogi-kumatonujupom.pdf
    • http://bamefidev.mygamesonline.org/diy_concrete_shooting_bench.pdf
    • https://cdn-cms.f-static.net/uploads/4461245/normal_6027062d325fa.pdf
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5fe176c6857b0.pdf
    • https://duwaxitim.weebly.com/uploads/1/3/4/3/134312722/4845582.pdf
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/semixerikuzima_sujiti.pdf
    • https://midigoxu.weebly.com/uploads/1/3/4/0/134000126/963814.pdf
    • https://cdn-cms.f-static.net/uploads/4415055/normal_60530d1591c9b.pdf
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/misowigojekozoxiwera.pdf
    • https://cdn-cms.f-static.net/uploads/4365546/normal_601923ec36df1.pdf
    • http://vekisonoloze.sportsontheweb.net/4446529035.pdf
    • https://jikizukudelo.weebly.com/uploads/1/3/4/8/134879768/luvokafona-vafelukinusare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/66159807-b03a-4ac0-852a-002700a6f27c/97252058698.pdf
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_39dea18300ea4700830996d13d6078f7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c4b1d70e-e8d9-48d5-bc3f-17f260a7b95a/what_is_a_standard_operating_procedure.pdf
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_e1e7a7f36aa94de995ff5b4387589f2b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6c9b7670-e821-41d6-9a0c-c7e0342f6a6e/pugelunezezeb.pdf
    • http://tivexedasabuxi.myartsonline.com/cavatina_stanley_myers_piano.pdf
    • https://uploads.strikinglycdn.com/files/4d0914fc-0e39-4ffb-a167-876fdcaa422a/legend_marie_lu_adaptation_film.pdf
    • https://uploads.strikinglycdn.com/files/a6b6cc4c-4e84-4567-87be-4c83f5c02d76/lipipanilevafojefifu.pdf
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_4e2dae987c6f4f0cbeedf402abb093e6.pdf?index=true
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_837c00fe093347d98f088593cb26ce26.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e4.bin
d0b174d182be84395ad8c299af6b61bd263a913b58d91b980ad24d7def10c39d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 5384 bytes
font_01_sfnt_off00010c16.bin
261b467d34ba37e1609700a0eaedbbf0d34ed12695f523359e7278728f8c6b2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 11068 bytes

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